Simply by removing the bump trigger and replacing it with a transistor we will be able to trigger this module to sound off at our will by sending it a voltage trigger by way of another sensor circuit or directly with a micro-controller.
Step 1: Remove the Sound Module
Find a seam along the backside of the toy near where you can feel the voice module underneath.
Using scissors or a knife separate the seam, work through the cotton batting and pull out the voice box.
The circuitry is encased in a simple box the houses the batteries , speaker and control circuit. (Sorry no pic for this, but it is straight forward)
Remove the screw in the top of the case and the unit will separate. The circuit simply pulls out.
Step 2: Find the "Knock" Detector and Remove
To verify, after you think you have found the knock sensor use a piece of wire and jump across the leads the unit should activate.
Now just desolder this component.
Step 3: Replace Trigger With NPN Transistor
Place the collector an emitter of the NPN transistor you are using into the board where the knock sensor mounted.
Bend the base pin outward to be used for a later signal.
Step 4: Remove Battery Leads and Connect Pigtail
Hot glue everything down to make it robust and you are done. Your voice module is ready to install on your robot, Halloween thingy or your staples easy button.